Mehdi Saberi;Hossein Yaghoobzadeh Shadmehri;Mohammad Tavakkoli Ghouchani;Alexandre Schmid
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引用次数: 0
Abstract
This brief proposes a low-voltage, high-precision, and high-dynamic-range current-mode analog winner-take-all (WTA) circuit. The proposed structure employs a new high-gain stage as a feedback network between the input node of each cell and the common node of the circuit to reduce the sensitivity of the output current to the loser signals, especially when they are close to the winner. In addition, another network is employed that senses the amount of the output/winner current and adjusts the bias current of the gain stages. This ensures that the drain-source voltage of the input transistor in the winner cell matches the behavior of the output transistor’s drain-source voltage, enhancing the accuracy as well as the input dynamic range (DR) of the structure. Moreover, since the circuit works properly with a minimum supply voltage of only
$V_{\text {GS}} + V_{\text {eff}}$
, it is a promising candidate for applications in emerging technologies with low supply voltage requirements. Based on the proposed structure, a three-input WTA circuit is designed and fabricated in a 0.18-
$\mu $
m CMOS technology. According to the measurement results, the proposed circuit exhibits a maximum error of 1.5% for the input signal range of
$60~\mu $
A when the input frequency is 100 kHz. The silicon area occupied by the circuit is
$33~\mu $
m
$\times 65~\mu $
m.
期刊介绍:
The IEEE Transactions on VLSI Systems is published as a monthly journal under the co-sponsorship of the IEEE Circuits and Systems Society, the IEEE Computer Society, and the IEEE Solid-State Circuits Society.
Design and realization of microelectronic systems using VLSI/ULSI technologies require close collaboration among scientists and engineers in the fields of systems architecture, logic and circuit design, chips and wafer fabrication, packaging, testing and systems applications. Generation of specifications, design and verification must be performed at all abstraction levels, including the system, register-transfer, logic, circuit, transistor and process levels.
To address this critical area through a common forum, the IEEE Transactions on VLSI Systems have been founded. The editorial board, consisting of international experts, invites original papers which emphasize and merit the novel systems integration aspects of microelectronic systems including interactions among systems design and partitioning, logic and memory design, digital and analog circuit design, layout synthesis, CAD tools, chips and wafer fabrication, testing and packaging, and systems level qualification. Thus, the coverage of these Transactions will focus on VLSI/ULSI microelectronic systems integration.